EP0846274B1 - Optischer geschwindigkeitssensor - Google Patents

Optischer geschwindigkeitssensor Download PDF

Info

Publication number
EP0846274B1
EP0846274B1 EP97930575A EP97930575A EP0846274B1 EP 0846274 B1 EP0846274 B1 EP 0846274B1 EP 97930575 A EP97930575 A EP 97930575A EP 97930575 A EP97930575 A EP 97930575A EP 0846274 B1 EP0846274 B1 EP 0846274B1
Authority
EP
European Patent Office
Prior art keywords
light beam
probe
velocimetric
optical
probe according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97930575A
Other languages
English (en)
French (fr)
Other versions
EP0846274A1 (de
Inventor
Jean-Marc Thomson-CSF S.C.P.I. BREDA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales Avionics SAS
Original Assignee
Thales Avionics SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thales Avionics SAS filed Critical Thales Avionics SAS
Publication of EP0846274A1 publication Critical patent/EP0846274A1/de
Application granted granted Critical
Publication of EP0846274B1 publication Critical patent/EP0846274B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave

Definitions

  • the field of the invention is that of velocimetric probes optics to define the speed of particles in relative motion relative to the probe.
  • a light source sends a beam on a particle, and we analyze the backscattered light, the speed of this particle gives the backscattered energy a frequency variation by relative to the frequency of the incident radiation.
  • FIG. 1 illustrates a device using this type of interference.
  • a laser diode source 11 emits a light beam L 1 in the direction of an optical splitter 12 capable of generating two beams of light L 11 and L 12 in the direction of a return optic MR so that the two beams L 11 and L 12 interfere in the measurement volume VM, by means of a lens 13 and by the same create interference fringes through which a particle P passes through the measurement volume in the direction Dz indicated in the figure 1.
  • Said back-scattering particle of light according to the beam L 2 , which is collimated through the lens 13, then focused through a lens 14, towards photodetection means 15.
  • the means are coupled to a device signal processing 16, capable of extracting information on the speed of the particle from the electrical signal delivered by the photodetection means 15.
  • velocimetric comprising means for amplifying energy backscattered.
  • the subject of the invention is a probe optical velocimetric comprising means for lighting by a light beam 1, a measurement volume through which can pass particles in relative motion relative to the probe and means for optical detection of a light beam 2 comprising a beam 3 of light backscattered by particles, to produce an electrical signal in response to the passage of a particle in the measurement volume (representative of the relative speed of the particle with respect to the probe), characterized in that it includes means for producing interference between a reference light beam 4 coming from the beam of light 1 and the beam of light 3, said interference being included in the light beam 2 and the wave surfaces of the light beams 3 and 4 being of the same geometry.
  • This type of probe is particularly well suited to aeronautical applications, using the speed of constituent particles atmospheric aerosols.
  • probes optical velocimetrics based on the longitudinal Doppler effect previously mentioned would not be satisfactory since on-board devices should not include sources too bulky, but rather smaller laser diode sources power and having too broad emission spectral widths, little adapted to the requirements linked to the longitudinal Doppler effect.
  • the optical velocimetric probe may include means for rendering the wave surfaces of the beams 3 and 4 identical and in particular in the case where the light beam 1 delivered is parallel and has a plane wave surface while the beam of backscattered light 3 is divergent and has a wave surface spherical.
  • the optical velocimetric probe may include as means for producing the light beam 1, a laser diode type source delivering an output beam 1, divergent and of elliptical section, this is advantageously coupled to a set collimator / anamorphoser capable of producing a light beam parallel and of circular section.
  • the velocimetric probe may also include means of deflection of the light beam 1, so as to bring at least one part of this beam in the direction of the light beam 3.
  • It may include means for focusing the beams of light 3 and 4, so as to cause said beams to interfere near the optical detection means.
  • the optical velocimetric probe includes means for determining several spatial components of the speed of the particles relative to the probe.
  • velocimetric probe characterized in that it includes means for alternately producing at least two light beams 1 and 1 ′ illuminating the measurement volume according to different incidences, so as to detect different components the relative velocity of the particle with respect to the probe.
  • means are provided for illuminating a particle animated at a speed v with respect to the probe, by several beams of light of different incidence.
  • FIG. 4 illustrates an example in which the mirror M 1 previously described is coupled to a mirror M ' 1 , near the optics 01.
  • the mirror M 1 is retracted periodically making it possible to generate outside the probe either beam 1 or beam 1 '.
  • the first beam is inclined relative to the optical axis by an angle + ⁇ and the second beam is inclined relative to the optical axis by an angle - ⁇ .
  • the generated optical signal is modulated at one of the frequencies f 1 or f 2 whose values are respectively:
  • the probe velocimetric of the invention comprises means for generating three bundles not located in the same plane and which are addressed successively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Claims (7)

  1. Optische Geschwindigkeitsmeßsonde mit Mitteln, um durch einen ersten Lichtstrahl (1) ein Meßvolumen zu beleuchten, durch das Partikel mit einer Relativgeschwindigkeit bezüglich der Sonde strömen, und mit Mitteln zur optischen Erfassung eines Lichtstrahls (2), um ein mit fester Frequenz amplitudenmoduliertes Signal zu erzeugen, mit einem von den Partikeln rückgestreuten Lichtstrahl (3) zur Erzeugung eines elektrischen Signals aufgrund des Durchgangs eines Partikels durch das Meßvolumen, wobei dieses Signal für die relative Geschwindigkeit des Partikels bezüglich der Sonde repräsentativ ist, dadurch gekennzeichnet, daß die Sonde Mittel enthält, um Interferenzen zwischen einem Bezugslichtstrahl (4), der vom ersten Lichtstrahl (1) abgeleitet ist, und dem rückgestreuten Lichtstrahl (3) zu erzeugen, wobei diese Interferenzen im erfaßten Lichtstrahl (2) enthalten sind und die Wellenfronten des rückgestreuten Lichtstrahls (3) und des Bezugslichtstrahls (4) gleiche Geometrien besitzen.
  2. Geschwindigkeitsmeßsonde nach Anspruch 1, dadurch gekennzeichnet, daß sie Mittel besitzt, um die Geometrie der Wellenfronten des rückdiffundierten Lichtstrahls (3) und des Bezugslichtstrahls (4) einander anzugleichen.
  3. Geschwindigkeitsmeßsonde nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß sie Mittel besitzt, um mindestens einen Teil (4) des ersten Lichtstrahls (1) in derselben Richtung wie die des rückdiffundierten Lichtstrahls (3) abzulenken.
  4. Geschwindigkeitsmeßsonde nach Anspruch 3, dadurch gekennzeichnet, daß sie ein Prisma (Pr) zur Ablenkung eines Teils (4) des ersten Lichtstrahls (1) besitzt.
  5. Geschwindigkeitsmeßsonde nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sie Mittel aufweist, um die optischen Pfade des rückdiffundierten Lichtstrahls (3) und des Bezugslichtstrahls (4) zwischen den Mitteln zur Beleuchtung des Meßvolumens und den Mitteln zur optischen Erfassung einander anzugleichen.
  6. Geschwindigkeitsmeßsonde nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß sie Mittel besitzt, um abwechselnd einen von mindestens zwei ersten Lichtstrahlen (1, 1') zu erzeugen, die das Meßvolumen gemäß unterschiedlichen Einfallswinkeln beleuchten, sodaß verschiedene räumliche Komponenten der Relativgeschwindigkeit des Partikels bezüglich der Sonde erfaßt werden.
  7. Geschwindigkeitsmeßsonde nach Anspruch 6, dadurch gekennzeichnet, daß die Mittel zur Erzeugung der beiden ersten Lichtstrahlen (1, 1') von einer gemeinsamen Beleuchtungsquelle gebildet werden und daß diese Mittel mindestens einen wegschwenkbaren Spiegel (M'1) im Verlauf dieser Lichtstrahlen aufweisen.
EP97930575A 1996-06-25 1997-06-24 Optischer geschwindigkeitssensor Expired - Lifetime EP0846274B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9607857 1996-06-25
FR9607857A FR2750215B1 (fr) 1996-06-25 1996-06-25 Sonde velocimetrique optique
PCT/FR1997/001122 WO1997050004A1 (fr) 1996-06-25 1997-06-24 Sonde velocimetrique optique

Publications (2)

Publication Number Publication Date
EP0846274A1 EP0846274A1 (de) 1998-06-10
EP0846274B1 true EP0846274B1 (de) 2002-09-11

Family

ID=9493375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97930575A Expired - Lifetime EP0846274B1 (de) 1996-06-25 1997-06-24 Optischer geschwindigkeitssensor

Country Status (5)

Country Link
US (1) US6040899A (de)
EP (1) EP0846274B1 (de)
DE (1) DE69715357T2 (de)
FR (1) FR2750215B1 (de)
WO (1) WO1997050004A1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2784456B1 (fr) 1998-10-09 2000-12-08 Sextant Avionique Dispositif de mesure de distance a effet magneto-optique et chaine de mesure incorporant ce dispositif
FR2820235B1 (fr) * 2001-01-26 2003-06-13 Thomson Csf Dispositif de retroeclairage pour ecran de visualisation par transmission compatible avec la vision de nuit
AUPR631801A0 (en) * 2001-07-12 2001-08-02 Luscombe, Andrew Roadside sensor system
US6819265B2 (en) * 2002-08-22 2004-11-16 Rosemount Aerospace Inc. Advanced warning ice detection system for aircraft
GB0304344D0 (en) * 2003-02-26 2003-04-02 Bae Systems Plc Gas velocity sensor
US7242481B2 (en) * 2003-09-22 2007-07-10 Celight, Inc. Laser vibrometry with coherent detection
US7126586B2 (en) * 2004-09-17 2006-10-24 Microsoft Corporation Data input devices and methods for detecting movement of a tracking surface by detecting laser doppler self-mixing effects of a frequency modulated laser light beam
EP2603811B1 (de) * 2010-08-09 2016-08-17 Technical University of Denmark Vektorgeschwindigkeitsmesser
DE102011085599B3 (de) * 2011-11-02 2012-12-13 Polytec Gmbh Vorrichtung und Verfahren zur interferometrischen Vermessung eines Objekts
FR3017963B1 (fr) * 2014-02-27 2016-03-25 Essilor Int Instrument optique pour identifier et localiser des microgravures presentes sur une lentille ophtalmique
FR3109627B1 (fr) * 2020-04-27 2022-10-14 Michelin & Cie Systeme de generation de signal representatif du profil d’une surface en mouvement par rapport au systeme
CN114324963A (zh) * 2022-01-06 2022-04-12 中国人民解放军国防科技大学 基于激光多普勒测速的转速测量系统

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1546508A1 (de) * 1966-12-14 1969-05-29 Solvay Mit Feuerloeschschaeumen vertraegliches Feuerloeschpulver
US3547540A (en) * 1967-12-15 1970-12-15 Nasa Laser fluid velocity detector
GB1377831A (en) * 1972-04-17 1974-12-18 Secr Defence Interferometers for fluid flow measurements
DE2852978C3 (de) * 1978-12-07 1981-06-04 Raimund Dr. 4005 Meerbusch Kaufmann Vorrichtung zur spektroskopischen Bestimmung der Geschwindigkeit von in einer Flüssigkeit bewegten Teilchen
US4610540A (en) * 1982-07-06 1986-09-09 General Electric Company Frequency burst analyzer
US4589070A (en) * 1982-10-25 1986-05-13 R & D Associates Airborne wind shear response system
US5006813A (en) * 1986-02-10 1991-04-09 Rockwell International Corporation Nonlinear optical doppler imaging amplifier
US4875770A (en) * 1987-03-23 1989-10-24 Lockheed Corporation Wind shear detector
US4925297A (en) * 1988-10-14 1990-05-15 The United States Of America As Represented By The Administrator, National Aeronautics And Space Administration Three-dimensional laser velocimeter simultaneity detector
IT1244170B (it) * 1990-12-04 1994-07-08 Cise Spa Apparecchiatura laser per la misura della velocita' di un fluido.
FR2670577B1 (fr) * 1990-12-18 1993-02-12 Sextant Avionique Dispositif d'analyse de capteurs interferometriques de micro-deplacements.
US5164784A (en) * 1992-01-17 1992-11-17 The Boeing Company CW doppler lidar
US5502558A (en) * 1994-10-03 1996-03-26 Menders; James H. Laser doppler velocimeter

Also Published As

Publication number Publication date
US6040899A (en) 2000-03-21
DE69715357T2 (de) 2003-06-05
FR2750215A1 (fr) 1997-12-26
WO1997050004A1 (fr) 1997-12-31
FR2750215B1 (fr) 1998-09-11
EP0846274A1 (de) 1998-06-10
DE69715357D1 (de) 2002-10-17

Similar Documents

Publication Publication Date Title
EP0406058B1 (de) Vorrichtung zur Windgeschwindigkeitsmessung in mittleren Höhen
EP0846274B1 (de) Optischer geschwindigkeitssensor
FR2751755A1 (fr) Velocimetre a laser a detection autodyne
EP1053453B1 (de) Verbesserungen bei der detektion von akustischen signalen
EP0027763B1 (de) Verfahren und Apparat zur Abstandsmessung durch Laserinterferometrie mit zwei Wellenlängen
WO2010058322A1 (en) Laser self-mixing differential doppler velocimetry and vibrometry
EP1346237B1 (de) Laser-anemometer
EP0645645B1 (de) Lasersonde für Geschwindigkeits- und Neigungsmessung
EP2405287B1 (de) Vorrichtung zur Laserfernerkennung, und Interferometrieverfahren
FR2761162A1 (fr) Dispositif de mesure de vitesse a effet doppler, notamment pour engins volants
EP0079276B1 (de) Verfahren und Einrichtung zur Messung der durch ein optisches System verursachten Formänderungen einer Wellenfläche
EP4078235A1 (de) Kalibrierung eines lidar-systems
EP0669525A2 (de) Interferometrisches System zur Feststellung und Ortung von reflektierenden Fehlern lichtleitender Strukturen
FR2953933A1 (fr) Sonde anemometrique bi-statique asservie
EP0561680B1 (de) Vorrichtung zum Messen der axialen Geschwindigkeit
EP0007827A1 (de) Laserkreisel
EP2132522A2 (de) Optisches metrologiesystem
FR2728971A1 (fr) Telemetre discret multifonctionnel
EP0635730A1 (de) Geschwindigkeitsmesser mit dynamischen Hologramm
FR3118197A1 (fr) Lidar cohérent à modulation de fréquence amélioré
EP0591911A2 (de) Interferometer bestehend aus einer integrierten Anordnung und einem reflektierenden Teil, die durch eine Messzone voneinander getrennt sind
EP0591912A2 (de) Interferometer, bestehend aus einer integrierten Anordnung und einem Spiegel, die durch eine Messzone voneinander getrennt sind
EP0813691A1 (de) Optisches system zur messung der geschwindigkeit und/oder des abstandes eines objektes
EP1014086A1 (de) Verfahren un Vorrichtung zur Messung der Ultraschalldämpfung zur zerstörungsfreien Prüfung durch Laser-Ultraschall
FR2732468A1 (fr) Analyseur de spectre acousto-optique large bande

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19980216

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THOMSON-CSF SEXTANT

17Q First examination report despatched

Effective date: 20001213

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THALES AVIONICS S.A.

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REF Corresponds to:

Ref document number: 69715357

Country of ref document: DE

Date of ref document: 20021017

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20021223

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20030612

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050616

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20050622

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060624

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070103

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060624